ChevelleWorld Decode Links
Pittsburg Plate & Glass (PPG)
Early PPG glass is coded with a 2-digit PPG plant code followed by a month/year 2- or 3-digit code while late codes are in Julian date format such as 2579 where 25 is the plant code, 7 is the month (July), and 9 is 1969.
Libby-Owens-Ford (LOF)
Libby-Owens-Ford uses a two-letter dating system. The first letter is the month code, the second letter is a year code.
Month Code | Year Code |
N - Jan | G - 1964/1977 |
X - Feb | J - 1965/1978 |
L - Ma | A - 1966/1979 |
G - Apr | Z - 1967/1980 |
J - May | X - 1968/1981 |
I - Jun | V - 1969/1982 |
U - July | T - 1970/1983 |
T - Aug | N - 1971/1984 |
A - Sep | Y - 1959/1972 |
Y - Oct | U - 1960/1973 |
C - Nov | L - 196/1974 |
V - Dec | I - 1962/1975 |
C - 1963/1976 |
Other information found on glass include
* Shaded Soft-Ray - if the glass is tinted
* AS - American Standard Association
* AS-1 - The -1 indicates windshield glass (Laminated)
* AS-2 - The -2 indicates body glass (Tempered)
* M3 - LOF manufacturing code for non-tinted windshield
* M4 - LOF manufacturing code for tinted windshield
* M51 - LOF manufacturing code for body glass
Windshield - GM Group 1.027
Ventilator Glass - GM Group 10.658
Front Side Glass - GM Group 10.681
Rear Quarter Glass (4-door) - GM Group 10.741
Rear Quarter Glass (2-door) - GM Group 11.011
Rear Window Glass - GM Group 11.204
Station Wagon Rear Window Glass - GM Group 12.180